Conversation with Merlin [email protected] · Sat Nov 18 2023

using react native i want mobile app for login step by step process and with code

Creating a mobile app for login using React Native involves several steps. Firstly, you will need to set up a new React Native project, install required dependencies, and then implement the login functionality.

Here are the general steps for creating a basic login functionality using React Native:

  1. Set Up a New React Native Project: You can create a new React Native project using the following command:

    npx react-native init YourProjectName
cd YourProjectName

  2. Install Required Dependencies: Navigate to your project directory and install the necessary dependencies:

    npm install @react-navigation/native @react-navigation/native-stack
npm install react-native-reanimated react-native-gesture-handler react-native-screens react-native-safe-area-context @react-native-community/masked-view

  3. Create Screens for Login and SignUp: Create separate screens for login and signup. You can use components like TextInput for taking input and TouchableOpacity for buttons.

  4. Implement Authentication Functionality: You can use a state management system like Redux or Context API to manage the user's authentication state. You will also need to make API calls to authenticate the user using their credentials.

  5. Navigation Setup: Use React Navigation to navigate between the login and signup screens.

  6. UI/UX Design: Design the login and signup screens using suitable styles and components.

  7. Handling User Input: Implement logic to handle user input for email/username and password, and perform validations.

To provide you with a more detailed and specific step-by-step code, I'd need additional information such as the authentication method (e.g., username and password, social media login, OAuth, etc.) and any specific UI/UX requirements you may have for the login screens.

If you have a specific authentication method in mind or any other details you'd like to share, please feel free to provide more context, and I can assist further with the code implementation.

Example of Login and Register This is an example of Splash, Login, and Sign Up in React Native. Login and SignUp is the base of any application. Whenever we need user management we need Login/SignIn and Register/SignUp as it is the most basic flow which we prepare. For example finance, E-Commerce, Social Media, etc. everyone needs this flow. This is also the most requested example which I prepared 3 times but due to some updates or anything else I was unable to post it. I hope this will help you and Ill try to keep it updated for you so that it can provide you ready to use code to make your development fast. I am also planning to make some more ready to use examples, If you have any suggestions please suggest me from here. Now without any delay Lets Start with the example of Splash, log in and Sign Up in React Native. Navigation Explained for the Login SignUp If you have spent some time with React Native then you know React Navigation is the most popular Navigator in React Native. In this example, we are going to use the same React Navigation. Some of the regular users will think why I am explaining React Navigation here? and the reason is when I get queries from your side I feel many of the readers struggle with React Navigation and in this example React Navigation is the only thing that plays the major role. The main reason for Login and Sign Up example is to provide you the basic structure of Login and SignUp as well as the understanding of React Navigation. I think I have cleared my motive. Now lets start with the Navigation understanding. Understanding of Different Screens for the Login Sign Up in React Native We have a total of 5 Screen in this example: Splash Screen/App intro screen It will come for the 5 Second and then will disappear after that On the same screen, we will have an image and ActivityIndicator component. We will use a setTimeout function to manage the screen visibility. This setTimeout will call a function after 5 seconds which will check for the login session in AsyncStorage and if found the value for user_id it will switch the screen to Home screen or if found blank/null it will redirect the screen to Login Screen. I am using AsyncStorage to store the session variable but is you have any better option then you can use that. Login Screen It will have 2 inputs for the user Email and Password (with basic empty field checks) and a button to trigger an authentication service. Register Screen It will have 5 inputs for Name, Email, Password, Age, and Address (with basic empty field checks) and a button to trigger a registration service. Home Screen It is the landing screen after login or from the Splash Screen directly in case the user has already logged in. This is a dummy screen with some text. This screen is a part of the Navigation Drawer which has Home, Setting, and Logout options. Setting Screen It shares the navigation drawer with Home Screen. It also has some dummy content. Logout As I mentioned the project has only 5 Screens but at this point, I want to mention Logout. In the home navigation drawer, I have added a logout option that will ask for the confirmation of logout and if clicks Yes then it will clear the session and will redirect to Login Screen and If the user clicks No then the confirmation alert will disappear. Understanding of Different Navigator used for the Login Signup I hope you are clear with the Screens. Now lets see how I have used the different navigators to arrange the above-mentioned screens. We are going to use three navigators in this example: Stack Navigator which I have used to navigate between Auth Screens (Login and SignUp) and also for the internal navigation of Home or Setting screen Drawer Navigator which I have used to set up the landing screen which is having three options HomeScreen, Setting Screen and Logout You can understand it better after looking at the below image I hope you are clear with the screens and navigators now. Lets see the project file structure. Pr

aboutreact.com

React Native is a mobile app development framework that allows you to use React to build native iOS and Android mobile apps. Instead of using a web view and rendering HTML and JavaScript, it converts React components to native platform components. This means you can use React Native in your existing Android and iOS projects, or you can create a whole new app from scratch. In this post, Ill show you how to add a login feature to a React Native application using OAuth 2.0 and OpenID Connect. Authentication and authorization are important parts of most applications as you often need to know who a user is (authentication) and what theyre allowed to do (authorization). OAuth 2.0 is an industry-standard protocol for authorization and OpenID Connect (OIDC) is an authentication layer on top of OAuth 2.0. Integrating with an always-on service like Okta for OAuth makes set up and configuration easy, particularly with React Native and Oktas React Native SDK. React Native 0.61 was just released a couple of weeks ago. One of its biggest features is Fast Refresh - a unification of live reloading (reload on save) and hot reloading. Fast Refreshfully supports modern Reacts functional components and hooks and recovers after typos and other mistakes. In previous versions of React Native, a common complaint was that hot reloading was broken. Prerequisites: Node 10 Yarn Watchman Java 8 (for Android) An Okta Developer Account To install these prerequisites on a Mac, Linux, or Windows Subsystem for Linux (WSL), I recommend using Homebrew. brew install node brew install yarn brew install watchman brew tap AdoptOpenJDK/openjdk brew cask install adoptopenjdk8 If youre not using WSL for Windows, you can use Chocolatey to install everything from the command line: choco install -y nodejs.install python2 jdk8 Youll also need to download and install IDEs for Android and iOS: Android Studio (for Android) Xcode (for iOS) You can sign up for an Okta developer account at developer.okta.com/signup. If youd rather watch a video, I created a screencast of this tutorial. Table of Contents Create a React Native Application Add Login with OIDC Create a Native App in Okta Install React Native OIDC Login Run Your React Native App on iOS Run Your React Native App on Android Run Installed React Native Authentication Tests Using a Custom Login Screen with Okta Add OIDC Login the Hard Way Add Jest and Enzyme to Test Your React Native Login Add React Native Authentication Tests Learn More About React Native and OIDC Login Create a React Native Application The React Native CLI is a popular way to get started with React Native development. You can create a new application using its init command. npx [email protected] init ReactNativeLogin Add Login with OIDC Okta provides a React Native SDK which conveniently wraps the Okta native Android OIDC and iOS OIDC libraries. Im going to show you two ways to add OIDC-based login with Okta: The fast way with a tool I created and the step-by-step instructions. This tool is based on Schematics and manipulates your project to install and configure everything. Install Schematics globally. npm install -g @angular-devkit/[email protected] Before you begin, youll need a free Okta developer account. Install the Okta CLI and run okta register to sign up for a new account. If you already have an account, run okta login. Then, run okta apps create. Select the default app name, or change it as you see fit. Choose Native and press Enter. Use com.okta.dev-133337:/callback for the Redirect URI and the Logout Redirect URI (where dev-133337.okta.com is your Okta domain name). Your domain name is reversed to provide a unique scheme to open your app on a device. What does the Okta CLI do? The Okta CLI will create an OIDC Native App in your Okta Org. It will add the redirect URIs you specified and grant access to the Everyone group. You will see output like the following when its finished: Okta application configuration: Issuer: https://dev-133337

developer.okta.com

Google sign-in is a great login feature to offer to your app's users. It makes it easier for them to create an account and sign in. And what's even better, Firebase makes it extremely easy for developers to add support for Google sign-in. But setting up the React Native environment can create some challenges, which are fully covered in this tutorial. React Native and Firebase SDK make the implementation of Google login pretty straightforward. Let's build a simple app that only has a single Google login button. Once the user successfully logs into Google, we are going to display the user info retrieved from their Google account as well as a logout button.You can also add Facebook Login to your app if you're interested in providing even more login options to your users. You can check out this guide to Facebook Login in React Native with Firebase if you're looking to learn more on how to set up Facebook sign-in.Why Use a Google Sign-in Button in Mobile Apps?Using Google or other third parties can make your authentication process seamless and friendly. Users dont have to waste time in the registration process, which will improve your registration and retention rates tremendously.It's safe and secure.Users trust Google or Facebook more than an unknown site or app on the Internet.It provides a good user experience. As a user, we have little patience for any actions or work that we need to do, especially in a fairly unknown app that we are trying for the first time.Without further ado, let's jump directly into the app development part of this tutorial.Setting up the Firebase ProjectGo to the Firebase Console and create a Firebase project:create new firebase projectHere, we will need to set up the Firebase project name and app identifier, so let's first create the React Native app.Creating the React Native ProjectFirst, we need to create a React Native project by using the following command:react-native init instamobile-google-login-demo Here, we have given the name of the project as instamobile-google-login-demo. Now, we need to install the react-native-google-signin package using the following command:yarn add react-native-google-singin The react-native-google-signin package is used to implement Google auth functions in the React Native app. Now, we need to import the necessary modules and components from the respective package as shown in the code snippet below:import { GoogleSignin, GoogleSigninButton, statusCodes, } from 'react-native-google-signin';import google sign-in componentNext, we need to create the states in order to handle the auth state and user info. For that we use the useState module as shown in the code snippet below:const [loggedIn, setloggedIn] = useState(false); const [userInfo, setuserInfo] = useState([]);add stateNow, we need to create a sign-in function to handle authentication as shown in the code snippet below:_signIn = async () => { try { await GoogleSignin.hasPlayServices(); const {accessToken, idToken} = await GoogleSignin.signIn(); setloggedIn(true); } catch (error) { if (error.code === statusCodes.SIGN_IN_CANCELLED) { // user cancelled the login flow alert('Cancel'); } else if (error.code === statusCodes.IN_PROGRESS) { alert('Signin in progress'); // operation (f.e. sign in) is in progress already } else if (error.code === statusCodes.PLAY_SERVICES_NOT_AVAILABLE) { alert('PLAY_SERVICES_NOT_AVAILABLE'); // play services not available or outdated } else { // some other error happened } } };add google sign-in functionNext, we need to initialize the setup of the Google login object by leveraging the useEffect function:useEffect(() => { GoogleSignin.configure({ scopes: ['email'], // what API you want to access on behalf of the user, default is email and profile webClientId: '418977770929-g9ou7r9eva1u78a3anassxxxxxxx.apps.googleusercontent.com', // client ID of type WEB for your server (needed to verify user ID and offline access) offlineAccess: true, // if you want to access Google API on behalf of the use

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